CN110824696A - Double-sided display device and control method thereof - Google Patents
Double-sided display device and control method thereof Download PDFInfo
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- CN110824696A CN110824696A CN201911173423.2A CN201911173423A CN110824696A CN 110824696 A CN110824696 A CN 110824696A CN 201911173423 A CN201911173423 A CN 201911173423A CN 110824696 A CN110824696 A CN 110824696A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/004—Optical devices or arrangements for the control of light using movable or deformable optical elements based on a displacement or a deformation of a fluid
- G02B26/005—Optical devices or arrangements for the control of light using movable or deformable optical elements based on a displacement or a deformation of a fluid based on electrowetting
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
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Abstract
The invention provides a double-sided display device and a control method thereof. The double-sided display device includes: a substrate; a flat layer disposed on one side of the substrate; the plurality of light-emitting units are arranged on one side of the flat layer, which is far away from the substrate, and comprise bottom-emitting light-emitting units and top-emitting light-emitting units; an encapsulation layer covering the plurality of light emitting cells; the first electrowetting ink layer is arranged on one side, far away from the bottom emission light-emitting unit, of the flat layer; the second electrowetting ink layer is arranged on one side, away from the top emission light-emitting unit, of the packaging layer; and, the first electrowetting ink layer and the second electrowetting ink layer are both formed by electrowetting inks. According to the double-sided display device, the first electrowetting ink layer and the second electrowetting ink layer are respectively arranged in the light emitting directions of the bottom emission light emitting unit and the top emission light emitting unit, and the electrowetting ink can be moved away under the action of an electric field, so that the double-sided display device is controlled to be switched among a bottom emission display mode, a top emission display mode and a double-sided display mode.
Description
Technical Field
The invention relates to the technical field of display, in particular to a double-sided display device and a control method thereof.
Background
With the development of Organic Light Emitting Diodes (OLEDs), the demand for display devices is no longer limited to single-sided display, and therefore, double-sided display devices having a double-sided display function have been developed. And the double-sided display device has very great application prospect in the aspects of mobile electronic equipment such as foldable mobile phones, tablet computers and the like.
Particularly, as a dual-sided display device of a foldable mobile phone, switching between front-side single-sided display (i.e., a bottom emission display mode) and back-side single-sided display (i.e., a top emission display mode) before and after folding is required, and even a scene in which both front and back sides are required to be simultaneously displayed (a dual-sided display mode) appears. Therefore, how to switch the dual-sided display device between the bottom emission display mode, the top emission display mode, and the dual-sided display mode is very important.
Disclosure of Invention
The present invention has been completed based on the following findings of the inventors:
in the research process, the inventor of the present invention finds that an Electrowetting (EW) technology can change the wettability of a liquid drop on a transparent substrate, that is, change the contact angle of the liquid drop, and further cause the liquid drop to generate phenomena of deformation and displacement by changing the voltage between the liquid drop and an insulating transparent substrate. Therefore, the inventor designs the double-sided display device, the first electrowetting ink layer is arranged on the light-emitting surface of the bottom emission light-emitting unit, the second electrowetting ink layer is arranged on the light-emitting surface of the top emission light-emitting unit, and the light-emitting direction of the double-sided display device can be controlled by applying an electric field, so that the double-sided display device can be switched among a bottom emission display mode, a top emission display mode and a double-sided display mode.
In a first aspect of the invention, a dual-sided display device is presented.
According to an embodiment of the present invention, the double-sided display device includes: a substrate; a planarization layer disposed on one side of the substrate; the light-emitting units are arranged on one side, far away from the substrate, of the flat layer and comprise bottom-emitting light-emitting units and top-emitting light-emitting units; an encapsulation layer covering the plurality of light emitting cells; the first electrowetting ink layer is arranged on one side, away from the bottom emission light-emitting unit, of the flat layer; the second electrowetting ink layer is arranged on one side, away from the top emission light-emitting unit, of the packaging layer; and, the first and second electrowetting ink layers are both formed from electrowetting inks.
According to the double-sided display device, the first electrowetting ink layer is arranged in the light emitting direction of the bottom emission light emitting unit, the second electrowetting ink layer is arranged in the light emitting direction of the top emission light emitting unit, and the electrowetting ink forming the two electrowetting ink layers can be removed under the action of an electric field, so that the light emitting direction of the double-sided display device is controlled, and the switching among the bottom emission display mode, the top emission display mode and the double-sided display mode is further realized.
In addition, the double-sided display device according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the invention, the electrowetting ink is black opaque.
According to the embodiment of the present invention, a plurality of the bottom emission light emitting units and a plurality of the top emission light emitting units are alternately arranged.
According to an embodiment of the present invention, the light emitting unit includes a pixel defining layer having an opening; a reflective anode, a light emitting layer and a transmissive cathode are arranged in the opening of the top emission light emitting unit in a laminated manner; in the opening of the bottom emission light emitting unit, a transmissive anode, the light emitting layer, the transmissive cathode, and a reflective cathode are stacked.
According to the embodiment of the invention, the orthographic projection of the opening of the bottom-emitting light-emitting unit on the flat layer falls into the orthographic projection of the first electrowetting ink layer on the flat layer; an orthographic projection of the opening of the top-emitting light-emitting unit on the packaging layer falls within an orthographic projection of the second electrowetting ink layer on the packaging layer.
According to an embodiment of the invention, the transmissive cathode is a monolithic structure and the reflective cathode is patterned.
According to an embodiment of the invention, the material forming the transmissive cathode comprises silver and the material forming the reflective cathode comprises aluminum.
According to an embodiment of the present invention, the materials forming the transmissive anode and the reflective anode each include at least one of aluminum, neodymium, copper, and silver.
In a second aspect of the present invention, the present invention provides a control method of the above-mentioned dual-sided display device.
According to an embodiment of the present invention, the control method includes: by applying an electric field to at least one of the first and second electrowetting ink layers, the electrowetting ink moves to switch the dual-sided display device between a bottom emission display mode, a top emission display mode, and a dual-sided display mode.
By adopting the control method of the double-sided display device provided by the embodiment of the invention, the characteristic that the electrowetting ink can move under the action of the electric field is utilized, and the double-sided display device is switched among a bottom emission display mode, a top emission display mode and a double-sided display mode by applying the electric field to at least one of the first electrowetting ink layer and the second electrowetting ink layer. It will be appreciated by those skilled in the art that the features and advantages described above with respect to the dual-sided display device are still applicable to the control method of the dual-sided display device and will not be described herein again.
In addition, the double-sided display device according to the above embodiment of the present invention may further have the following additional technical features:
according to the embodiment of the invention, an electric field is applied to the first electrowetting ink layer, and the electrowetting ink in the first electrowetting ink layer moves, so that the double-sided display device is in a bottom emission display mode; applying an electric field to the second electrowetting ink layer, and enabling the electrowetting ink in the second electrowetting ink layer to move, so that the double-sided display device is in a top emission display mode; and applying an electric field to the first electrowetting ink layer and the second electrowetting ink layer simultaneously, wherein the electrowetting inks in the first electrowetting ink layer and the second electrowetting ink layer move, and then the double-sided display device is in a double-sided display mode.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing aspects of the invention are explained in the description of the embodiments with reference to the following drawings, in which:
fig. 1 is a schematic cross-sectional view of a double-sided display device according to an embodiment of the present invention;
FIG. 2 is a schematic layout of a bottom-emitting light-emitting unit and a top-emitting light-emitting unit according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a dual-sided display device according to another embodiment of the present invention.
Reference numerals
100 substrate
200 flat layer
310 bottom emission light emitting unit
320 top emission lighting unit
301 transmissive anode
302 reflective anode
303 pixel definition layer
304 opening
305 light emitting layer
306 transmissive cathode
307 reflective cathode
400 encapsulation layer
510 first electrowetting ink layer
511 first insulating layer
520 second electrowetting ink layer
521 second insulating layer
600 cover plate
Detailed Description
The following examples of the present invention are described in detail, and it will be understood by those skilled in the art that the following examples are intended to illustrate the present invention, but should not be construed as limiting the present invention. Unless otherwise indicated, specific techniques or conditions are not explicitly described in the following examples, and those skilled in the art may follow techniques or conditions commonly employed in the art or in accordance with the product specifications.
In one aspect of the invention, a dual-sided display device is provided.
According to an embodiment of the present invention, referring to fig. 1, a dual-sided display device includes: a substrate 100, a planarization layer 200, a plurality of light emitting cells, an encapsulation layer 400, a first electrowetting ink layer 510 and a second electrowetting ink layer 520; wherein, the flat layer 200 is disposed on one side of the substrate 100; the plurality of light emitting cells are disposed on a side of the planarization layer 200 away from the substrate 100, and the light emitting cells include a bottom emission light emitting cell 310 and a top emission light emitting cell 320; the encapsulation layer 400 covers the plurality of light emitting cells; the first electrowetting ink layer 510 is disposed on a side of the planarization layer 200 away from the bottom emission light emitting unit 310; the second electrowetting ink layer 520 is disposed on a side of the encapsulation layer 400 away from the top-emitting light-emitting unit 320; also, both the first electrowetting ink layer 310 and the second electrowetting ink layer 320 are formed of electrowetting inks. The surface of the "electrowetting ink" is specially treated to have a surface charge, so that the surface tension of the electrowetting ink can be changed under the action of an electric field; and the arrows in fig. 1 represent the light emitting directions of the light emitting units.
The inventor of the invention finds that when the electrowetting ink layer in the display device is manufactured by using the electrowetting technology, when voltage is applied to the electrowetting ink layer, the surface tension of the liquid drop of the electrowetting ink close to the electrode can be changed, so that the static state is not stable any more, the liquid drop is transferred to the side, a partially transparent pixel point can be formed, the transparent display effect is achieved, and the light emitted by the light-emitting unit is allowed to penetrate; after the electrowetting ink layer is powered off, the surface tension of the liquid drop is recovered to completely shield the light emitted by the light-emitting unit, so that the effect of shading is achieved.
Therefore, a first electrowetting ink layer 510 is disposed in the light emitting direction of the bottom emission light emitting unit 310, and a second electrowetting ink layer 520 is disposed in the light emitting direction of the top emission light emitting unit 320, so that the electrowetting inks forming the two electrowetting ink layers can be removed under the action of an electric field, thereby controlling the light emitting direction of the dual-sided display device, and further realizing the switching among the bottom emission display mode, the top emission display mode and the dual-sided display mode.
In some embodiments of the present invention, the electrowetting ink may be black and opaque, so that the light shielding effect of the first electrowetting ink layer 510 and the second electrowetting ink layer 520 may be more significant, thereby more effectively absorbing the high brightness light emitted by the light emitting unit and achieving a complete light shielding effect without applying an electric field.
In some embodiments of the present invention, referring to fig. 2, a plurality of bottom emission light emitting cells (which may include R, G, B three sub-pixels) and a plurality of top emission light emitting cells (which may include R ', G ', B ' three sub-pixels) may be alternately arranged. It should be noted that fig. 1 and 3 are schematic cross-sectional views along line CC' in fig. 2.
According to an embodiment of the present invention, referring to fig. 3, each of the light emitting units may include a pixel defining layer 303, the pixel defining layer 303 having an opening 304; in the opening 304 of the top emission light emitting unit 320, a reflective anode 302, a light emitting layer 305, and a transmissive cathode 306 are provided in a stacked manner; in the opening 304 of the bottom emission light emitting unit 310, a transmissive anode 301, a light emitting layer 305, a transmissive cathode 306, and a reflective cathode 307 are stacked. The term "stacked arrangement" specifically means that the layers are arranged in order in the direction from the substrate 100 to the encapsulation layer 400. Thus, the top-emission light-emitting unit 320 and the bottom-emission light-emitting unit 310 can be formed by substantially the same process, and only the patterned reflective anode 302, transmissive anode 301 and reflective cathode 307 need to be formed separately
In some embodiments of the present invention, an orthographic projection of the opening 304 of the bottom-emitting light-emitting unit 310 on the planarization layer 200 falls within an orthographic projection of the first electrowetting ink layer 510 on the planarization layer 200; and the orthographic projection of the opening 304 of the top-emitting light-emitting unit 320 on the encapsulation layer 400 falls within the orthographic projection of the second electrowetting ink layer 520 on the encapsulation layer 400. Therefore, the electrowetting ink layer can fully shield the light emitted by the light-emitting unit, and a single-sided display mode is realized.
In some specific examples, an orthographic projection of the first electrowetting ink layer 510 on the planarization layer 200 may completely coincide with an orthographic projection of the bottom emission light emitting unit 310 on the planarization layer 200, and an orthographic projection of the second electrowetting ink layer 520 on the encapsulation layer 400 may completely coincide with an orthographic projection of the top emission light emitting unit 320 on the encapsulation layer 400. In this way, each electrowetting ink layer can sufficiently shield a single light emitting cell area, thereby preventing the problem of light leakage.
In some embodiments of the present invention, the transmissive cathode 306 may be an integral layer structure, i.e., the transmissive cathode 306 covers the light emitting layers 305 of the bottom emission light emitting unit 310 and the top emission light emitting unit 320, while the reflective cathode 307 is patterned, i.e., the reflective cathode 307 is disposed only in the bottom emission light emitting unit 310. Thus, the bottom emission cathode formed by connecting the whole layer of the transmission cathode 306 and the patterned reflection cathode 307 in parallel can significantly reduce the sheet resistance thereof, thereby reducing the risk of open circuit and solving the problem of uneven brightness.
According to an embodiment of the present invention, the materials forming the transmissive cathode 306 and the reflective cathode 307 may respectively include at least one of aluminum, silver, magnesium-silver alloy, and calcium, and thus, the entire layer or the patterned cathode shape may be formed through a sputtering process. In some embodiments of the present invention, the transmissive cathode 306 may be made of silver and have a thickness of 5-15 nm, such as 10nm, and the reflective cathode 307 may be made of aluminum and have a thickness of 8-20 nm, such that the thinner transmissive cathode 306 is semitransparent to allow the light emitted from the light-emitting layer 305 of the top-emission light-emitting unit 320 to pass through from the top surface, and the thicker reflective cathode 307 is a reflective layer to allow the light emitted from the light-emitting layer 305 of the bottom-emission light-emitting unit 310 to be reflected from the top surface and to pass through from the bottom surface.
According to an embodiment of the present invention, the materials forming the reflective anode 302 and the transmissive anode 301 may respectively include at least one of aluminum (Al), neodymium (Nd), copper (Cu), and silver (Ag), so that the reflective anode 302 and the transmissive anode 301 using the same material only need to adjust their thicknesses, so that the transmissive anode 301 is semi-transparent and the reflective anode 302 is a reflective layer.
According to an embodiment of the present invention, referring to fig. 3, the dual-sided display device may further include a first insulating layer 511, a second insulating layer 521 and a cover plate 600, wherein the first insulating layer 511 is disposed on the same layer as the first electrowetting ink layer 510, the second insulating layer 521 is disposed on the same layer as the second electrowetting ink layer 520, and the cover plate 600 is disposed on the second electrowetting ink layer 520 and a side of the second insulating layer 521 away from the substrate 100. In this way, the first electrowetting ink layer 510 may be formed by filling electrowetting ink in the opening of the first insulating layer 511, and the second electrowetting ink layer 520 may be formed by filling electrowetting ink in the opening of the second insulating layer 521; and the cover plate 600 can protect the surface of the dual-sided display device, so that the structure and function of the dual-sided display device are more complete.
In summary, according to the embodiments of the present invention, the present invention provides a dual-sided display device, wherein a first electrowetting ink layer is disposed in a light emitting direction of a bottom emission light emitting unit, and a second electrowetting ink layer is disposed in the light emitting direction of a top emission light emitting unit, and the electrowetting inks forming the two electrowetting ink layers can be removed under an electric field, so as to control the light emitting direction of the dual-sided display device, and further realize switching among a bottom emission display mode, a top emission display mode, and a dual-sided display mode.
In another aspect of the present invention, the present invention provides a control method of the above-mentioned dual-sided display device.
According to an embodiment of the present invention, the specific structure of the double-sided display device may refer to the foregoing description, and the control method includes: by applying an electric field to at least one of the first electrowetting ink layer 510 and the second electrowetting ink layer 520, specifically, for example, by generating an electric field through an additionally disposed metal wire, the electrowetting ink moves to cause at least one of the bottom surface and the top surface of the dual-sided display device to emit light, thereby switching the dual-sided display device between a bottom emission display mode, a top emission display mode, and a dual-sided display mode.
In some embodiments of the present invention, an electric field is applied to the first electrowetting ink layer 510 disposed in the light emitting direction of the bottom-emitting light-emitting unit 310, the electrowetting ink moves, and the light emitted from the top-emitting light-emitting unit 320 is blocked by the second electrowetting ink layer 520 in the non-powered state, so that the light is only emitted from the bottom surface of the dual-sided display device, and the dual-sided display device is in the bottom-emitting display mode.
In other embodiments of the present invention, an electric field is applied to the second electrowetting ink layer 520 disposed in the light emitting direction of the top-emitting light-emitting unit 320, the electrowetting ink moves, and the light emitted from the bottom-emitting light-emitting unit 310 is blocked by the first electrowetting ink layer 510 in the non-powered state, so that the light is only emitted from the top surface of the dual-sided display device, and the dual-sided display device is in the top-emitting display mode.
In other embodiments of the present invention, an electric field is applied to both the first electrowetting ink layer 510 and the second electrowetting ink layer 520, and the electrowetting inks move, so that light is emitted from both the bottom surface and the top surface of the dual-sided display device, and the dual-sided display device is in a dual-sided display mode.
In summary, according to the embodiments of the present invention, the present invention provides a control method, which utilizes a characteristic that the electrowetting ink is movable under an electric field, and applies the electric field to at least one of the first electrowetting ink layer and the second electrowetting ink layer to switch the dual-sided display device between the bottom emission display mode, the top emission display mode, and the dual-sided display mode. It will be appreciated by those skilled in the art that the features and advantages described above with respect to the dual-sided display device are still applicable to the control method of the dual-sided display device and will not be described herein again.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A dual-sided display device, comprising:
a substrate;
a planarization layer disposed on one side of the substrate;
the light-emitting units are arranged on one side, far away from the substrate, of the flat layer and comprise bottom-emitting light-emitting units and top-emitting light-emitting units;
an encapsulation layer covering the plurality of light emitting cells;
the first electrowetting ink layer is arranged on one side, away from the bottom emission light-emitting unit, of the flat layer;
the second electrowetting ink layer is arranged on one side, away from the top emission light-emitting unit, of the packaging layer;
and, the first and second electrowetting ink layers are both formed from electrowetting inks.
2. The dual sided display device of claim 1, wherein the electrowetting ink is black opaque.
3. The dual-sided display device of claim 1, wherein a plurality of the bottom emission light emitting units and a plurality of the top emission light emitting units are alternately arranged.
4. The dual-sided display device according to claim 1, wherein the light emitting unit includes a pixel defining layer having an opening; a reflective anode, a light emitting layer and a transmissive cathode are arranged in the opening of the top emission light emitting unit in a laminated manner; in the opening of the bottom emission light emitting unit, a transmissive anode, the light emitting layer, the transmissive cathode, and a reflective cathode are stacked.
5. The dual sided display device of claim 4, wherein an orthographic projection of the opening of the bottom emitting light unit on the planar layer falls within an orthographic projection of the first electrowetting ink layer on the planar layer; an orthographic projection of the opening of the top-emitting light-emitting unit on the packaging layer falls within an orthographic projection of the second electrowetting ink layer on the packaging layer.
6. The dual sided display device of claim 4, wherein the transmissive cathode is a monolithic structure and the reflective cathode is patterned.
7. The dual sided display device of claim 4, wherein the material forming the transmissive cathode comprises silver and the material forming the reflective cathode comprises aluminum.
8. The dual-sided display device of claim 4, wherein the materials forming the transmissive anode and the reflective anode each comprise at least one of aluminum, neodymium, copper, and silver.
9. A control method of a dual-sided display device according to any one of claims 1 to 8, comprising:
by applying an electric field to at least one of the first and second electrowetting ink layers, the electrowetting ink moves to switch the dual-sided display device between a bottom emission display mode, a top emission display mode, and a dual-sided display mode.
10. The control method according to claim 9,
applying an electric field to the first electrowetting ink layer, and enabling the electrowetting ink in the first electrowetting ink layer to move, so that the double-sided display device is in a bottom emission display mode;
applying an electric field to the second electrowetting ink layer, and enabling the electrowetting ink in the second electrowetting ink layer to move, so that the double-sided display device is in a top emission display mode;
and applying an electric field to the first electrowetting ink layer and the second electrowetting ink layer simultaneously, wherein the electrowetting inks in the first electrowetting ink layer and the second electrowetting ink layer move, and then the double-sided display device is in a double-sided display mode.
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| CN114170919A (en) * | 2021-12-13 | 2022-03-11 | Tcl华星光电技术有限公司 | Double-sided display panel and double-sided display splicing screen |
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| CN105810714A (en) * | 2016-03-16 | 2016-07-27 | 武汉华星光电技术有限公司 | OLED display apparatus with two-sided display function, and manufacturing method therefor |
| CN106783913A (en) * | 2016-11-17 | 2017-05-31 | 武汉华星光电技术有限公司 | AMOLED display with double faces |
| CN106601773A (en) * | 2016-12-15 | 2017-04-26 | 武汉华星光电技术有限公司 | Double-sided OLED display device and the manufacturing method for the same |
| CN107680989A (en) * | 2017-07-26 | 2018-02-09 | 友达光电股份有限公司 | Double-Sided Display And Manufacturing Method Thereof |
| CN110224008A (en) * | 2019-06-06 | 2019-09-10 | 京东方科技集团股份有限公司 | A kind of display panel and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112310299A (en) * | 2020-10-27 | 2021-02-02 | 武汉华星光电半导体显示技术有限公司 | Double-sided display panel and preparation method thereof |
| CN114170919A (en) * | 2021-12-13 | 2022-03-11 | Tcl华星光电技术有限公司 | Double-sided display panel and double-sided display splicing screen |
| WO2023108745A1 (en) * | 2021-12-13 | 2023-06-22 | Tcl华星光电技术有限公司 | Double-sided display panel and double-sided display joined screen |
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